The name is based on when it is discovered.

This asteroid is no threat.  Just a rumor.

http://www.theweathernetwork.com/news/articles/asteroid-2014-yb35-will-not-skimming-earth-for-terrifying-encounter/48073/

"That's equates to a closest approach that's just shy of 4.5 million kilometres, or over 11 times farther away than the Moon!"